Final answer:
The adult heart holds approximately 4.7 to 5.7 liters of blood, pumping about 10,000,000 liters or 2.6 million gallons in a lifetime.
Step-by-step explanation:
The average adult heart holds approximately 4.7 to 5.7 liters (or 5-6 quarts) of blood. Assuming an average flow rate of 5.00 liters per minute, over a 75-year lifespan, the heart would pump a volume of approximately 10,000,000 liters or 2.6 million gallons of blood. This is a massive amount of blood, equivalent to about 200 times the volume of water in a 6-lane 50-meter lap pool.